RFR: 8313424: JavaFX controls in the title bar (Preview) [v81]

[Cormac Redmond]

On Thu, 5 Jun 2025 00:50:30 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

>> Implementation of [`StageStyle.EXTENDED`](https://gist.github.com/mstr2/0befc541ee7297b6db2865cc5e4dbd09).
>
> Michael Strauß has updated the pull request incrementally with one additional commit since the last revision:
> 
>   rename WindowManager to DesktopEnvironment

It appears that the CSS of the Window icons cannot be overridden; see below example which doesn't apply css.css.

What is the proper/expected way to style the window icons; and should there be some documentation on this somewhere in HeaderBar?


public class MyApp extends Application {

    @Override
    public void start(Stage stage) {
        Button button = new Button("My button");
        HeaderBar.setAlignment(button, Pos.CENTER_LEFT);
        HeaderBar.setMargin(button, new Insets(5));
        HeaderBar headerBar = new HeaderBar();
        headerBar.setCenter(button);

        // Doesn't apply to window icons
        headerBar.getStylesheets().add(Objects.requireNonNull(getClass().getResource("css.css")).toExternalForm());

        BorderPane root = new BorderPane();
        root.setTop(headerBar);

        Scene scene = new Scene(root);

        // Doesn't apply to window icons
        scene.getStylesheets().add(Objects.requireNonNull(getClass().getResource("css.css")).toExternalForm());

        stage.setScene(scene);
        stage.initStyle(StageStyle.EXTENDED);
        stage.show();
    }
}


**css.css** (put in same directory as class)

.iconify-button:hover,
.maximize-button:hover {
    -fx-background-color: green;
}

.iconify-button.dark:hover,
.maximize-button.dark:hover {
    -fx-background-color: yellow;
}

.close-button:hover {
    -fx-background-color: pink;
}

-------------

PR Comment: https://git.openjdk.org/jfx/pull/1605#issuecomment-2951311555